Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 3: Quantum Communication

QI 3.6: Talk

Monday, March 18, 2024, 10:45–11:00, HFT-TA 441

Quantum conference key agreement in networks with bipartite entanglement sources — •Anton Trushechkin, Giacomo Carrara, Justus Neumann, Hermann Kampermann, and Dagmar Bruß — Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Institute for Theoretical Physics III, Universitätsstr. 1, Düsseldorf 40225

We analyze quantum conference key agreement (QCKA) in networks with arbitrary topology and focus on decentralized networks with bipartite entanglement sources (rather than sources of multipartite entangled states like GHZ-states or W-states). Various strategies of QCKA are discussed. In particular, we compare the performance of genuine QCKA with parallel bipartite quantum key distribution (QKD) and derive the secret key rates based on the properties of the network. Also we show that QCKA on multipartite 2-entangled states cannot exceed the rates achievable by parallel bipartite QKD protocols.

Keywords: quantum key distribution; quantum conference key agreement; multipartite entanglement; quantum networks